On analyzing the characteristics of coal mine heating systems, this article lists the problems with the existing heating systems used in coal mines and the reasons for energy wasting.

分析了矿区供热系统的特点，简述了当前供热系统存在的问题及浪费能源的原因；

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The oil heating way mainly relies on the existing heat-conducting and heat-tracing systems for maintaining oil temperature in pipeline.

管道输送的输油温度主要依靠原有导热油加热和伴热系统加热；

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The council said the restoration work will cost "millions of pounds", and involves rewiring, replacement of existing heating systems and weatherproofing works.

BBC: Swansea's Brangwyn Hall to close for facelift

We know how to improve the efficiency of your existing heating and cooling systems.

FORBES: John Berger